Physics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.4393z&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 24, p. 4393-4396
Physics
12
Planetology: Solar System Objects: Mars, Planetology: Solid Surface Planets: Gravitational Fields, Planetology: Solid Surface Planets: Interiors, Planetology: Solid Surface Planets: Tectonics
Scientific paper
Eighteen profiles of ~N-S-trending topography from the Mars Orbiter Laser Altimeter (MOLA) are used to analyze the shape of Mars' northern hemisphere. MOLA observations show smaller northern hemisphere flattening than previously thought. The hypsometric distribution is narrowly peaked with >20% of the surface lying within 200 m of the mean elevation. Low elevation correlates with low surface roughness, but the elevation and roughness may reflect different mechanisms. Bouguer gravity indicates less variability in crustal thickness and/or lateral density structure than previously expected. The 3.1-km offset between centers of mass and figure along the polar axis results in a pole-to-equator slope at all longitudes. The N-S slope distribution also shows a subtle longitude-dependent variation that may represent the antipodal effect of the formation of Tharsis.
Aharonson Oded
Banerdt Bruce W.
Neumann Gregory A.
Phillips Roger J.
Smith David E.
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